Modern people, In spite of their scientific knowledge,often seem as superstitios as their ancestors.Astrology is a half-billion-dollar business.Intelligent peraons still believe that lines on their palm or the arrangement of tea leaves in a cup preditc the future.Airplanes do not have a row of seats numbered 13,and buildings omit a thirteenth floor.Black cats,broken mirrors and spilled salt create fear and anxiety in many people.And ouija boards continue to be a popular pastime.